Feed mechanism for sewing-machines.



FEED MECHANISMYFOR SEWING MACHINES. AEPLICATIONHLED AuG.7. 1915.

1 ,2 37., 322. E Patented Aug. 21, 1917.

2 SHEETS-SHEET l.

4w. c. FREE. FEED-MECHANISM FOR SEWING MACHINES.

APPLICATION FILED AUG-7. |915.

Patented Aug. 21, 1917.

2 SHEETS-*SHEET 2.

I I I I I I l Y I 72237255535 IL Q UNITED STATES; PATENT ormcn WILLIAM cefrnnn, or RocKroRn, ILLINOIS.y f n ingrese. y

To all-whom t may concern: f

Beit .known thatl I, WILLIAM C. FREE, aV citizen of the United States, residing at Rockford, Winnebago cunty,vIllinois, have invented certain new anduseful- Improvements in Feed AMechanism for Sewing-Ma shines,4 offwhich the following-[is a speciicationl My invention relates. to the means' employed fior feeding the fabric `or material being sewed a distance corresponding tov the length offstitch v.desired between each reci procation cf the needle. i Forthis purpose itis customary to e'mploy'afeed dog consisting of a small plate with, a series of, pointed proj ectionsL adjacentto or partially surrounding the needle andk connected tey suitable means forgiving ity an advancingmovement` while `sprojecting abovethey surfaceof 1 the head plate and in contact with the material being yoperated upon, and a reverse movement when withdrawn, belowjthe head plate yof the machine head. rlhe extent of y horizontal movement at each operation corresponds to the `length ofthe stitch desired, andprovi- `sion is made for adjusting the device to any length of stitch desired. The invention which forms the subject mattertof `the present application relates to mechanism of this t character and for-v vthis purpose, which isl simpley and relativelyvfinexpensive to manufacture,ldurable, `cenet, 1n operation and especially adapted for use kin a machine hav-v` ing a constantly operating shaft extending lengthwise of the machine head, as for example for the purpose of operating the shuttle. A machine head of `this character is shown in my Patent No. 1,062,389, covering` an improvement in shuttle operating mechanism, infwhich the shuttle is operated by a shaft extendingsubstantially centrallyj and longitudinally of the head plate of the machine. mechanism such shuttle operating shaft is preferablyutilized to'operatel the cloth feed mechanism.

In the accompanying drawings and in the following specificationl kI have rshown `and described a preferred formof my invention as applied to a sewing machine y head of this type. Itis to be understood, however, that the specific disclosure is for the purpose of exemplication yonly and that the scope of the invention is defined kin the followingclaims in which I have endeavored t to diatnguish it from, the prier art se far In my `improved feed- `rniii) MEcHANIsMfroR sEwING-MncI-Imns.

as known to me without, however, relinquishmg or abandoning any portion or 'feature thereof. i

In theaccompanying drawings Figure 1` is a bottom plan view of a sewing machine lof Jany known or approved formv andisy shown as usual of cast metal and formed with' bearings 7, 8 `for the shuttle `operating shaft v9.' The specific form of this shaft and f itsconnections are immaterial for the present purpose except as hereinafter specified, but

saidshaft is shown as driven by pitmen 10,

11 ysuitably connected to the needle driving shaft of the machine, noty shown. The shuttle y carrier 12 may be of the construction shown in my said patent and'is operated from the shaft 9 in the manner therein described. At

the 4left hand end of the shaft, as shown in Fig. 1, is formed with offset portions 14, which are circular in cross section and 1,eccentric to the axis of the shaft for the purpose of transmitting to the feed dog the movement above described. The feed dog 16 "proper may be of any suitable design and Iextends as usual through an opening in the head plate into position to feed the material being sewed. Beneath the head plate it is connected as by screw 17 with a carrier plate 18, which is formed as best shown in Fig. 3

with an open-ended horizontal slot'` which n Specification@Hertel-ment@ Patented Aug. 21', 1.917. L .ippnafion aleafaugust 7,1915. seriainaaazsa f toir y receives the eccentric portion 14 of the drive y shaft 9. The carrier plate is formed with a tail piece 19 extendingy horizontally thereyfrom and pivoted at 20 to the rockerk arm 21 which is pivoted t0 the casting at 21. ,Obviously, if the last-named element were maintained stationary in the position shown in the figures, the revolution of the drive shaft would result in a substantially vertical movey ment of the feed dog. In order to give the feed dog the necessary feed movement, I

provide mechanism for rocking the arm 21 at suitable times in relation to the vertical movement of the feed dog. For this purposek a connecting plate 22 is pivoted at 23 to the rocker arm 21 and at its other end by a screw 24 te a link 25 whes'e other end is see cured by a screiv 26 to an adjusting arm 27 upon the adjustingl shaft 2S. Said shaft is frictionally held in its bearings 29, 3 0 and is angularly adjustable by the'finge'r piece 31'- extending through and above the head plate and the graduated arc' 32, (see Fig. 5). As seen more particularly in Fig. 2, the rocker arm 2l and link 25 together control the path of movement of the connecting plate 22. The latter is given movement from the cam l5 upon the drive shaft which cooperates for this purpose avith aMslot-SS formed in said connecting plate. Vhen the drive shaft is revolved it tends' toimpart a vertical movementtothe connecting plate, but such movement is only possible when accompanied by a lateral shiftof the'oonnecting plate because of theconnections of the latter to thevrocker arm 21 and link 25 respectively. The ylink 25 is always inclined to the horizontal but to a lesser or greater degree according. to the positionof the finger piece 3l. j The -more closely it approaches the horizontal the less the horizontal movement of the connecting plate required to permit the vertical movevment' thereof imparted by the eccentric on the ,drive `shaft. By shifting the finger piece and the' shaft 2x8 and arm 27 connected thereto the n'ormally stationary pivot 26 of the link 27V n'ray be raised or lowered, lWithin a small angle, to adjust the length of stitch to that desired, since the horizontal movement of the dog is substantially that of the connecting plate.

\ Thus, it will be seen that both the vertical and lateral movement of the dog are derived from the one shafty but fromseparate cams thereon Which may beso designed or angularly displaced about the aXis of the shaft with reference to each other as to properly time the' lateralwith'reference to the vertical movement of the dog and the timing of each with reference tro' the stroke of the needle may be determined by the angular position of said cams with reference to the eccentric of the shaft byl which the shuttle is driven and which in turn is driven from the needleoperating shaft. The vertical: movement of the dog being dependent only upon" the cam upon the constantly-rotating shaft is invariable', but-the lateral movement of the dog may be varied as above described according s tothe length of stitch desired. j

j The construction is simple, easy tomanu'- facture, reliable in operation and not easily deranged orinjured.

I claim:

ln a device of the class described, a revoluble shaft, shuttlecarrier, a cam connection between the shuttle carrier" and shaft for operating the former, cams on said shaft, a

dog carrier, Ia pivoted arm to the free' end of1 'which said dog' carrier' is' pivoted,"said carrier being horizontally slotted toenbi'ace one of the cams on said shaft, a dog'c'arrled by said carrier', a' .Connecting plate having a substantiallyA horizontal slot engagingL the other of saidA cams, said plate likewise pivotedfto. said pivoted arm, a; adjustable about its axis, a pin eccentricaldly mounted on saidshaft -and a link connection b'e'tvveen said lpin and the end of said connecting plate.

WILLIAM C:

Witnesses 2' j i f l D M. Denken, 

